bin/strict-bashism-check: only check, what was changed

1 files changed, 12 insertions, 1 deletions

diff --git a/bin/strict-bashism-check b/bin/strict-bashism-check
index 8e58e05..b5a8eb6 100755
--- a/bin/strict-bashism-check
+++ b/bin/strict-bashism-check
@@ -8,6 +8,11 @@ else
   against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
 fi
 
+check_files=$(
+  git diff --cached --name-status "${against}" \
+  | cut -f2
+)
+
 # If you want to allow non-ASCII filenames set this variable to true.
 allownonascii=$(git config --bool hooks.allownonascii)
 
@@ -93,7 +98,13 @@ if command -v shellcheck >/dev/null 2>&1; then
       -not -name 'opcode' \
       -not -name 'opcode_list' \
       -not -name '.*' \
-      -execdir shellcheck -x '{}' \; 2>&1
+    | grep -xF "${check_files}" \
+    | while read -r file; do
+      (
+        cd "${file%/*}" || exit $?
+        shellcheck -x "${file##*/}" 2>&1
+      )
+    done
   )
 
   if [ -n "${errors}" ]; then